Slow Rider,
What year truck?
I do not know about other years, but the glass on Advance Design doors are held in place with a glass setting tape (I think it is made up of soapstone and fabric and other things. Of course, I could be dreaming). The "tape" is available from most repo parts vendors (Chevy Duty has tape for 47-50 and 51-54 - full-pane and vented doors). You set the glass in a u-channel made from the tape and then put mineral oil (or engine oil) on the tape. The oil expands the tape and the window is set.
Sorry if I misunderstand your question.
Good luck,
Tim
